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Nature 426, 779-780 (18 December 2003) | doi:10.1038/426779a;

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Planetary science: Icy martian mysteries

Among the grandest of mysteries about planet Earth is the origin of its ice ages and related climate change. Human civilization developed during a warm, 'greenhouse' climatic interlude of several thousand years within the overall 'ice-house' conditions of a major ice age that became most intense during the past two million years.

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